i use different exchanges and some time online sites for for crypto currencies for trading.
Well I am using only the most trusted exchanges like poloniex and most of the time I am monitoring my trades with yobit.
Because I find it very easy to use and to buy with different alt coins that I am able to trade. And I am selling all my trades fast if I am able to see a good profit.
And that is ranging $5-$10 per day.
For altcoins I can recommend yobit as they have a variety of altcoins to choose from, personally I use yobit in altcoins but for bitcoins I use poloniex, it is good to have different exchanges just to make sure you will not loss your whole amount of money when something bad came up like a hacking.